Practice in water, of course only with a buddy! That will raise your static time for sure.
Also try the dynamic apnea in pool, swimming (at the bottom, in mask, with fins)
On bike doing a one minute static (dynamic) while biking is not bad at all. This movement is much different than dynamic with fins i.e. In water you can relax more, so you consume less oxygen, even while doing DYF or DNF.
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